Electrical heating unit.



' H. H. RUSSELL. ELECTRICAL HEATING UNIT.

APPLICATION FILED APRJS, 1911. I

Patented Aug. 26, 1913.

6 J ji'z/ezzzf'or UNITED STATES PATENT OFFICE.

HENRY H. RUSSELL, OF NEW YORK, N. Y., ASSIGNOR TO WALTER D. HUDSON, 0F

' J'ANESVILLE, WISCONSIN, a v

ELEcTEIcAL HEATING UNIT. 3

Specification of Letters Patent. Application filed April 6, 1911. Serial No. 619,231.

Patented Au 26,1913.

- ing Units, of which the following is a specificati on.

My invention relates to improvements in electrical heating units such as may for instance housed in connection with the usual fir l ss cooker. It is illustrated diagrammatically in one form in the accompanying drawing wherein- Figure l is a plan view of the device. Fig. 2 is a section along the line 22 of Fig. 1. Fig. 3 is a'plan view of the unit with the top removed. Fig. 4 is a view similar to that shown in Fig. 3 of a modified form.

Like parts are indicated by like letters in all the figures.

The heatingunit A, which is provided with the usual recess A, containing the lifting ring A isperforated at A andis made up of two more or less similar fiat disks B, B and held together by the cement B The flat resistance wire B which is bent back and forth radially within the unit A isembedded within the cement B and terminates at either end in the conducting sleeve B which is embedded in the plates B, B and concentric wit-h the perforations A and contains the spring member B In the modified form illustrated in Fig.- 4 the resistance wire C is wound spirally about the thin, flat, insulating plate G which is contained between similar disks C but one of which is shown, and terminates in similar sleeves C in the perforations C".

It will be evident that while I have shown in my drawing an operative device, still many changes might be made, both in size, shape and arrangement of parts, without de-. parting materially from the spirit of my invention and "I wish, therefore, that my drawing be regarded as in a sense diagrammatic.

The use and operation of my invention are as follows: When it is desired to heat the radiator, the terminal sleeves which are embedded within the body of the plate are connected up to any suitable source of electric power by certain means, not here shown, whereby live terminals are introduced into the perforations in the disk and brought in contact with the embedded sleeves. The current passing through the resistance wire soon brings it to a relatively high heat and thoroughlyheats the radiator from the interior outwardly. The result is to provide a radiator which'is evenly heated and in which the path of the heat is never reversed, as it is in the case of the radiator which is first heated from the outside in and then gives off its heat from the inside out. By providing the embedded contacts or terminals, I make use of some particular apparatus for the heating of the device, ,thus we venting risk of fire by the heating of the device at some unsuitable time'or place,that is to say, if it were possible by using any ordinary conducting wires connected up at one end to the source of poiver and connected up at the other to the exposed terminals on the radiator, a careless operator might throw on the current and heat up the radiator when it was in contact with inflammable substances. If then he should neglect it fora few moments it would heat up to sue temperature as to set these substances on fire and cause considerable damage. This of course, could not be done when the device is arranged as I have indicated because it is impossible to connect the terminals to the source of power until they are brought into proper relation with some receptacle or ap paratus which is designed to prevent dan ger from fire caused by overheating ofthe exposed radiator.

It will be evident that in view of the fact that the radiator is heated from the inside outwardly instead of from the outside in wardly, the heating may be done in this manner with a very much higher efficiency and less loss in view of the fact that all of the heat which is generated in the radiator must pass through it and heat it-and'is -not thereforewasted, as is the case when a; very large amount of heat is applied to the outside, a large percentage of which is of course wasted and passes away without ever coming in contact with the radiator.

The terminal conducting sleeves are embedded within the heating unit, being free to move about within it, although of course being limited in their motion. The purpose of this is to prevent any cracking or distortion or jamming or locking of the parts when heat is applied, such as might take. place owing to the possible different coeiiicients of expansion of the heating unit, the sleeves themselves and the electrodes which must be inserted to couple the heating coil with the source of electrical power. The

5 looseness of the sleeves also permits them to =ing rigidly held together in position, said diskebeing perforated, the perforations in said disks being in line with each other to .-fi trm' a passage completely through the element, said passage being of constantly di- 20 minishing cross sectional area from the surface of the element inwardly, and terminal sleeves located one in each of: said perforations of smaller. diameter than the passage at the surface of the disks, said sleeves being electrically connected one to each terminal of the heating unit, said sleeves terminating on either side below the surface of the heat- HENRY 1a.. RUSS LL, Witnesses FRANCiS "W. PARKER, J12, SOPHIE B. WERNER.

coplel of this patent may be obtained for five cents each, by addressing the fiemmissioner of Patents, I l

' Washington, D. C. 

